Google+ is on course to sign up 22% of U.S. adults with online access during the next 12 months, which would mean it would overtake Twitter and LinkedIn to become the country's second-largest social network, according to a Bloomberg/YouGov survey. Overseas, however, Google+ could cause problems for Google's other social network, Orkut, which remains popular in Brazil. "In a global branding effort and with their global war on Facebook, the Orkut brand is lost at sea," Michael Scissons writes.

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